About This Chapter
How It Works:
- Identify the lessons in the Holt McDougal Planet Earth chapter with which you need help.
- Find the corresponding video lessons with this companion course chapter.
- Watch fun videos that cover the Earth topics you need to learn or review.
- Complete the quizzes to test your understanding.
- If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.
Students will learn:
- Solar energy
- Earth's tilt and orbit
- Geography of the seasons
- The Equator and tropics
- Water distribution on earth
- The water cycle
- Water resource issues and conservation
- Types of landforms
- Plate tectonics
- Continental drift
- Plate boundaries
- Mechanical weathering
- Soil erosion
- Geography and climate
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1. What is Solar Energy? - Definition, Pros & Cons
Learn about solar energy and how charged particles from the sun travel to Earth to provide heat and light. Explore solar energy as a direct and indirect energy source and examine the pros and cons of harvesting solar energy for other uses.
2. Earth's Axial Tilt & Orbit Around the Sun
After watching this video, you will be able to describe the Earth's orbit around the Sun, including the orbital plane, its eccentricity, and axial tilt. A short quiz will follow.
3. Geography of the Four Seasons
This lesson will explain how the earth's axis and rotation affect seasons. In doing this, it will also highlight the concept of the summer and winter solstices, as well as how seasons vary around the globe.
4. The Equator, the Tropics of Cancer & Capricorn: Association with Earth-Sun Geometry
After watching this video, you will be able to explain what the Equator, the Tropic of Cancer, and the Tropic of Capricorn are in terms of latitude and longitude. A short quiz will follow, allowing for further review of the material.
5. The Distribution of Water on Earth
Water covers most of Earth but in a variety of forms. In this video lesson you will learn about how water is distributed on Earth, though you may be surprised to find out just how little of it we can access!
6. The Water Cycle: Precipitation, Condensation, and Evaporation
This lesson discusses the processes water takes as it moves around the Earth in the water cycle. You'll get an in-depth look at condensation, precipitation, and evaporation.
7. Water Resource Issues: Activities Affecting the Water Supply
This video lesson describes water resources issues such as aquifer depletion, overdrawing surface waters and salinization of irrigated soil. You will also learn about the impacts of activities affecting water resources.
8. Water Conservation: How Water Management Can Lead to Sustainable Use
In this video lesson you will learn about the importance of water conservation. You will also learn about the two ways freshwater is used, and how proper water use can lead to sustainability in agriculture, homes, and manufacturing.
9. Landform: Definition & Types
Read about landforms and their major features. Learn the differences between formations like mountains and hills, valleys and canyons. (Hint: It has to do with their form.)
10. Plate Tectonics: A Unified Theory for Change of the Earth's Surface
After many years of trying to solve the mystery of the moving continents, enough data and evidence was collected to develop a unifying theory of how the surface of the earth changes. It's called plate tectonics.
11. Alfred Wegener's Theory of Continental Drift
People used to think that Earth was static, and that it never changed. Gradually, a body of evidence was gathered that made no sense in this model. Alfred Wegener, Geologic Supersleuth, laid the groundwork for a whole new theory for the large-scale changing nature of the earth.
12. Plate Boundaries: Convergent, Divergent, and Transform Boundaries
In the theory of plate tectonics, the earth's crust is broken into plates that move around relative to each other. As a result of this movement, three types of plate boundaries are formed: divergent, convergent, and transform boundaries.
13. Mechanical Weathering: Definition, Process, Types & Examples
Over time, the forces of the natural environment cause rocks to physically break down in a process called mechanical weathering. Learn how factors, such as wind, water and temperature fluctuations lead to mechanical weathering.
14. What is Soil Erosion? - Definition and Causes
With soil erosion, the top layer of soil is worn away due to factors such as water, wind and tillage of farmland. Learn about soil erosion and how natural elements and human activities break up and transport soil.
15. Geography and Climate: Effects on Civilizations
In this lesson, we will look at the relationship between geography, climate, and civilization. We will learn why civilizations develop in particular regions and how this leads to lifestyle and cultural differences.
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Other chapters within the Holt McDougal Introduction to Geography: Online Textbook Help course
- Holt McDougal Introduction to Geography Chapter 1: A Geographer's World
- Holt McDougal Introduction to Geography Chapter 3: Climate, Environment & Resources
- Holt McDougal Introduction to Geography Chapter 4: The Word's People - Culture & Population
- Holt McDougal Introduction to Geography Chapter 4: The Word's People - Government, Economy & Global Connections